511 – America’s Traveler Information Telephone Number

By calling 511, travelers can receive detailed, real-time information
on traffic conditions, construction updates, and severe weather
alerts on many of the nation’s interstate highways.

Currently, 31 state and regional 511 systems serve drivers in
25 states. By 2012, drivers will be able to get real-time traffic
updates coast-to-coast by dialing 511. Depending on the driver’s
location, they will be connected to the 511 service in the region
or state in which they are traveling.